Noise Reduction Device of Air Compressor

ABSTRACT

A noise reduction device of compressor for gas is arranged at the inlet end of the compressor. The noise reduction device includes a noise reduction gas return housing and a plurality of gas inlet small pipes, gas inlet large pipes, gas return large pipes, and gas return small pipes, respectively arranged in the noise reduction gas return housing. The design and arrangement that the gas inlet large pipes and the gas return large pipes are respectively sleeved on the gas inlet small pipes and the gas return small pipes changes the moving path of the gas in the noise reduction gas return housing in an instantaneously reverse manner. Such moving path change mainly reduces the flow rate of the gas, so that the noise generated by the gas can be effectively reduced.

BACKGROUND OF THE PRESENT INVENTION Field of Invention

The present invention relates to a noise reduction device of air compressor, and in particular, to a noise reduction device utilizing pipes with various diameters sleeving with one another to change the moving paths of the gas.

Description of Related Arts

It is noted that air compressor is mainly utilized for producing high-pressure gas, and then a pneumatic tool can be driven by the high-pressure gas to perform the machining operation. For example, Taiwan Patent No. M325394, entitled “Improvement of Air Compressor Structure”, provides a general and common air compressor. However, when the conventional air compressor is compressed upon inhalation of external gas, the gas flow rate of inlet end of the air compressor is fast, rendering very large gas noise and consequently causing noise pollution in its working environment. In order to effectively reduce the noise, the industry has come out some relative technologies. For example, U.S. Patent Application, US20180283367A1, entitled “Air Compressor Noise Dampener”, changes the gas travel path through having the gas to hit a baffle, so as to reduce the gas moving speed, thereby achieving the purpose of reducing gas noise. Therefore, the technology of reducing the noise of the air compressor has been increasingly important and the present invention aims to provide an alternative novel device for reducing noise in order to provide an applicable option for the users.

SUMMARY OF THE PRESENT INVENTION

Hence, an object of the present invention is to provide a noise reduction device of air compressor that is capable of effectively reducing the inlet noise of gas.

Accordingly, the present invention provides a noise reduction device of compressor, such as an air compressor, configured to be arranged at an inlet end of the compressor, so as to reduce the noise of the intake gas, such as air, wherein the air compressor comprises at least a gas tube. The noise reduction device comprises a noise reduction gas return housing, and a plurality of gas inlet small pipes, gas inlet large pipes, gas return large pipes, and gas return small pipes disposed in the noise reduction return housing. The noise reduction air return housing has an intake chamber, a gas return chamber, and an exhaust chamber, sequentially and adjacently arranged therein, wherein the intake chamber has at least one gas inlet allowing external gas to enter, the exhaust chamber has at least one gas outlet communicating with the gas inlet end of the compressor, wherein each of the gas inlet small pipes is communicated with the intake chamber, wherein each of the gas inlet large pipes has a first gas return end formed in an open manner on the end thereof that faces toward the intake chamber, wherein each of the gas return small pipes is communicated with the exhaust chamber, wherein each of the gas return large pipes covers and sleeves an outer side of the corresponding gas return small pipe and internally communicates therewith, wherein each of the gas return large pipes has a second gas return end formed in an open manner on an end that faces toward the exhaust chamber, wherein the first gas return ends and the second gas return ends are connected and communicated with the gas return chamber, so that when external gas enters the intake chamber, the gas enters the gas inlet large pipes through the gas inlet small pipes, enters the gas return chamber through the first gas return ends, enters the gas return large pipes through the second gas return ends, enters the exhaust chamber through the gas return small pipes, and then enters the air compressor through the gas outlet. The design and arrangement that the gas inlet large pipes and the gas return large pipes are respectively sleeved on the outer side of the gas inlet small pipes and the gas return small pipes changes the moving path of the gas in an instantaneously in a reverse manner. Such gas moving path change mainly reduces the flow rate of the gas, so as to effectively reduce the noise generated by the gas.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a compressor connected with a noise reduction device according to a preferred embodiment of the present invention.

FIG. 2 is a partially sectional view of the noise reduction device according to the above preferred embodiment of the present invention.

FIG. 3 is a sectional view of the noise reduction device according to the above preferred embodiment of the present invention.

FIG. 4 is a sectional view of a noise reduction device according to another preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIGS. 1-3, according to a preferred embodiment of the present invention, a noise reduction device 1 configured to be in conjunction with a compressor 2, such as an air compressor, that is capable of being turned on and off. It is arranged and assembled on an inlet end of the compressor 2, so as to reduce the noise of the intaking gas, such as air. The inlet end of the compressor 2 has three gas tubes 21 connected therewith externally according to the preferred embodiment. The noise reduction device 1 comprises a noise reduction gas return housing 3 and a plurality of gas inlet small pipes 4, a plurality of gas inlet large pipes 5, a plurality of gas return large pipes 6, a plurality of gas return small pipes 7, and a plurality of silencing cotton sleeves 8 arranged in the noise reduction gas return housing 3, wherein the plurality of silencing cotton sleeves 8 is configured to cover and sleeve on the outside of the gas inlet small pipes 4, the gas inlet large pipes 5, the gas return large pipes 6, and the gas return small pipes 7 respectively. The noise reduction gas return housing 3 comprises an intake chamber 31, a first baffle 32, an gas return chamber 33, an exhaust chamber 34, and a second baffle 35, sequentially arranged adjacent to each other. The intake chamber 31 comprises two gas inlets 311 for allowing external gas to enter. According to the preferred embodiment, the gas inlets 311 are respectively adapted for being connected with a filter 22. In other words, the external gas is first filtered through the filter 22 and then enters the intake chamber 31, so as to prevent dust from entering the interior of the noise reduction gas return housing 3. The first baffle 32 is obliquely arranged in the intake chamber 31 for changing the path of the gas entering the intake chamber 31. The two ends of the first baffle 32 respectively keep an intake gap 36 from the intake chamber 31. The exhaust chamber 34 comprises three gas outlets 341 communicating with the gas tubes 21 of the compressor 2. The second baffle 35 is obliquely disposed in the exhaust chamber 34 for changing the path of the gas entering the exhaust chamber 34. The two ends of the second baffle 35 respectively keep an exhaust gap 37 from the exhaust chamber 34. The air inlet small pipes 4, air inlet large pipes 5, air return large pipes 6, and air return small pipes 7 are arranged in the gas return chamber 33. Each of the gas inlet small pipes 4 is also communicated with the intake chamber 31. Each of the gas inlet large pipes 5 covers and sleeves on the outside of the corresponding gas inlet small pipe 4 and is internally communicated therewith. Besides, each of the gas inlet large pipes 5 forms a first gas return end 51 in an open manner on the end thereof facing towards the intake chamber 31. The gas return large pipes 6 and the gas return small pipes 7 are arranged above the gas inlet small pipes 4 and the gas inlet large pipes 5, wherein each of the gas return small pipes 7 is communicated with the exhaust chamber 34. Each of the gas return large pipes 6 covers and sleeves on the outside of the corresponding air return small pipe 7 and is internally communicated therewith. In addition, each of the gas return large pipes 6 forms a second gas return end 61 in an open manner on the end thereof facing towards the exhaust chamber 34. The first gas return ends 51 and the second gas return ends 61 are communicated with the gas return chamber 33. The silencing cotton sleeves 8 are respectively sealed at the first gas return end 51 of the gas inlet large pipes 5 and the second gas return end 61 of the gas return large pipes 6, and are respectively contacted with the wall surfaces of the intake chamber 31 and the exhaust chamber 34 to form a closed state, so that the gas can only penetrate to enter the gas return chamber 33 and the gas return large pipes 6.

When the compressor 2 is operating, the external gas that enters the intake chamber 31 through the filter 22, will first hit the first baffle 32 and then shifts route to fill out the intake chamber 31 through the intake gaps 36 on the two sides, and then sequentially enters the gas inlet small pipes 4 and the gas inlet large pipes 5. Then the gas is discharged from the first gas return end 51 to pass through the silencing cotton sleeve 8 to enter the gas return chamber 33. Next, the gas in the gas return chamber 33 passes through the silencing cotton sleeves 8 again to enter the gas return large pipes 6 through the second gas return end 61 and then enter the exhaust chamber 34 to hit the second baffle 35 through the guiding of the gas return small pipes 7. Then the gas will fill out the exhaust chamber 34 through the exhaust gaps 37 of the two sides and guided into the compressor 2 through the gas tube 21.

The design the noise reduction device 1, according to the preferred embodiment of the present invention, utilizes the arrangement of the gas inlet large pipes 5 and the gas return large pipes 6 respectively sleeved on the outside the gas inlet small pipes 4 and the gas return small pipes 7, to change the moving path of the gas in an instantaneously reverse manner, as well as coordinates the arrangement of the first baffle 32 and the second baffle 35 to also change the moving path of the gas. The changes of the moving path of the gas are mainly to reduce the flow rate of the gas, so that the noise generated by the gas can be effectively reduced. In addition, having the gas travels through the silencing cotton sleeves 8 to disperse the gas flow can further reduce the noise generation.

It should be further noted that, in the design, it may be based on the need of noise reduction, to properly add silencing cotton sleeves 8 or other silencing cotton materials and means, such as sheet-shaped silencing cotton (not shown) in the gas return chamber 33 or to fill up the space of the gas return chamber 33, so as to achieve a better noise reduction result.

Referring to FIG. 4, the structure of the noise reduction device 1 according to another preferred embodiment of the present invention is mostly the same as it of the above preferred embodiment, which also comprises a noise reduction air return box 3 and a plurality of gas inlet small pipes 4, gas inlet large pipes 5, gas return large pipes 6, gas return small pipes 7, and silencing cotton sleeve 8. The main difference of the present embodiment is in that the noise reduction device 1 further comprises an expanded tube set. The expanded tube set 9 comprises a plurality of special pipes 91 with various diameters, respectively adapted for being sleeved on the outside of the gas inlet large pipes 5 and the gas return large pipes 6 with one of the ends in a closed state and the other ends communicating with the gas return chamber 33. At this time, the silencing cotton sleeves 8 are sleeved on the outside the special pipes 91, so as to increase the flow path of the gas and more effectively reduce the noise of the gas flow through the adding of the special pipes 91. However, the diameters of the special pipes 91 of the expanded tube set 9 of the present embodiment may be arranged in a diverse manner, such that special bore pipes of various bores may be sleeved with one another, so as to properly extent the path of the gas flow and achieve the best noise reduction effect. 

What is claimed is:
 1. A noise reduction device of compressor for being arranged at an inlet end of a compressor so as to reduce noise of intaking gas, comprising: a noise reduction gas return housing comprising an intake chamber, an gas return chamber, and an exhaust chamber sequentially and adjacently arranged therein, wherein said intake chamber has at least one gas inlet allowing external gas to enter, and said exhaust chamber has at least one gas outlet for communicating with the inlet end of the compressor; and a plurality of gas inlet small pipes, gas inlet large pipes, gas return large pipes, and gas return small pipes, disposed in said noise reduction gas return housing, wherein each of said gas inlet small pipes is communicated with said intake chamber, wherein each of said gas inlet large pipes has a first gas return end formed in an open manner on an end thereof that faces toward said intake chamber, wherein each of said gas return small pipes is communicated with said exhaust chamber, wherein each of said gas return large pipes covers and sleeves an outer side of one of said gas return small pipes correspondingly and internally communicates therewith, wherein each of said gas return large pipes has a second gas return end formed in an open manner on an end that faces toward said exhaust chamber, wherein said first gas return ends and said second gas return ends are connected and communicated with said gas return chamber, so that when a gas enters said intake chamber, the gas enters said gas inlet large pipes through said gas inlet small pipes, enters said gas return chamber through said first gas return ends, enters said gas return large pipes through said second gas return ends, and enters said exhaust chamber through said gas return small pipes, before entering the inlet end of the compressor through said gas outlet.
 2. The noise reduction device of compressor, as recited in claim 1, wherein said noise reduction gas return housing further comprises a first baffle and a second baffle, respectively arranged in said intake chamber and said exhaust chamber, wherein said first baffle is obliquely arranged in said intake chamber for changing a path of the gas entering said intake chamber, wherein two ends of said first baffle respectively keep an intake gap from said intake chamber, wherein said second baffle is obliquely arranged in said exhaust chamber for changing the path of the gas entering said exhaust chamber, wherein two ends of said second baffle respectively keep an exhaust gap from said exhaust chamber.
 3. The noise reduction device of compressor, as recited in claim 2, further comprising a plurality of silencing cotton sleeves covering and sleeving on said gas inlet large pipes and said gas return large pipes respectively.
 4. The noise reduction device of compressor, as recited in claim 2, further comprising an expanded tube set and a plurality of silencing cotton sleeves, wherein said expanded tube set comprises a plurality of pipes, respectively sleeved on said gas inlet large pipes and said gas return large pipes with one end closed and at least another end communicated with said gas return chamber, wherein said silencing cotton sleeves are respectively sleeved on said pipes.
 5. The noise reduction device of compressor, as recited in claim 4, wherein said plurality of pipes of said expanded tube set has various diameters adapted for sleeving with one another so as to increase a flow path of the gas. 